Made NtDelayExecution with a 0 timeout yield the CPU, as it is

supposed to.

configure

@@ -16144,6 +16144,7 @@ fi
 
 
 
+
 
 
 for ac_func in \
@@ -16188,6 +16189,7 @@ for ac_func in \
 	pwrite \
 	readlink \
 	rfork \
+	sched_yield \
 	select \
 	sendmsg \
 	settimeofday \

configure.ac

@@ -1099,6 +1099,7 @@ AC_CHECK_FUNCS(\
 	pwrite \
 	readlink \
 	rfork \
+	sched_yield \
 	select \
 	sendmsg \
 	settimeofday \

dlls/ntdll/sync.c

@@ -35,6 +35,9 @@
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
 #include <string.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -632,6 +635,9 @@ NTSTATUS WINAPI NtDelayExecution( BOOLEAN alertable, const LARGE_INTEGER *timeou
     {
         for (;;) select( 0, NULL, NULL, NULL, NULL );
     }
+#ifdef HAVE_SCHED_YIELD
+    else if (!timeout->QuadPart) sched_yield();
+#endif
     else
     {
         abs_time_t when;

include/config.h.in

@@ -500,6 +500,9 @@
 /* Define to 1 if you have the <sched.h> header file. */
 #undef HAVE_SCHED_H
 
+/* Define to 1 if you have the `sched_yield' function. */
+#undef HAVE_SCHED_YIELD
+
 /* Define to 1 if you have the <scsi/scsi.h> header file. */
 #undef HAVE_SCSI_SCSI_H